Incandescent bulbs augment central heating systems. What are the true savings of low energy bulbs?
An incandescent bulb is a very efficient reasonably cheap though low power air immersion heater, which also provides instant lighting. It may not be positioned in the best place and electricity is not the cheapest form of energy, but it does add heat thereby causing the central heating system to switch off earlier, saving gas, oil or electricity. The energy ratings on low energy bulbs are not a true indication of possible savings, are they?
You are quite right, – in the winter that extra heat is great.
They can be sold as “Winter bulbs”.
Of course in the summer we don’t need / want that extra heat.
So in late spring – change to low energy bulbs, – summer bulbs.